"...You are assuming the THS trim was 3 degrees at the start of the incident, but that is NOT stated..."
Yes, I am, and no, it's not. BUT,
"...At 2h10m51 we are told TO/GA was demanded and PF maintained NU inputs. Only NOW is the THS mentioned: [B]The THS passed from 3 to 13 degrees NU in about 1 minute..."
I know you read it this way, (three degrees @ 2:10:51),
I read it:
"Three degrees at 2:10:51 LESS "About a minute". This makes the Three degrees time @ +/- 2:09:51.
Since we are entertaining a loss of airdata @ 2:10:05, and the PF immediately input NU, it is illogical to assume the THS only Started its Trimming excursion at @ 2:10:51. . . If not, I defer to your conclusion.